The Study of Sabzevar Chromite Preconcentration with Advanced ore Sorting Techniques

Ore sorting Proposed proposed as an important step in the plant of chromite processing and the reported results in this field bounded. By using this method, substantial energy savings and increasing in production take place in the comminution stage. Ore sorting is done in three stages including entrance to the primary crusher, the output of the primary crusher and entrance to gravity separation which the primary crusher output stage has more favorable results. In this study, for separation with designed device, the identification and characterization of chromite ore is performed. Firstly, minerals imaged with three-dimensional scanner and by creating a cloud of points, the volume of chromite ore achieved and the equivalent diameter of stone pieces are determined. Then ores placed on the device’s conveyor and the mass of each pieces are measured by load cell sensor and the density of minerals determined. Finally, according to the size and specified conditions of each fraction, the grade of stone pieces determined and according to the limit specified for the grade of the ore driven to concentrate or tailings. The results showed that Sabzevar chromite with a grade of 26.16 percent with gaunge minerals after ore sorting, produces an initial concentrate with 33.11 and 83.92 percent of the grade and recovery respectively.